diff --git a/Dockerfile b/Dockerfile
index 03b4280..f78c80a 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -202,7 +202,7 @@ ENV           DNS_PORT=53
 # ENV           DNS_OVER_GRPC_PORT=553
 ENV           DNS_STUFF_MDNS=false
 
-ENV           METRICS_PORT=9253
+ENV           METRICS_LISTEN=:9253
 
 # NOTE: this will not be updated at runtime and will always EXPOSE default values
 # Either way, EXPOSE does not do anything, except function as a documentation helper
@@ -210,7 +210,7 @@ EXPOSE        $DNS_PORT/udp
 EXPOSE        $DNS_OVER_TLS_PORT/tcp
 EXPOSE        $DNS_OVER_TLS_LEGO_PORT/tcp
 #EXPOSE        $DNS_OVER_GRPC_PORT/tcp
-EXPOSE        $METRICS_PORT/tcp
+EXPOSE        $METRICS_LISTEN/tcp
 
 # Lego just needs /certs to work
 VOLUME        /certs
diff --git a/README.md b/README.md
index cd2d3eb..67a431a 100644
--- a/README.md
+++ b/README.md
@@ -175,7 +175,7 @@ You can also tweak the following:
  * DNS_OVER_GRPC_PORT (default to 553)
 -->
  * DNS_STUFF_MDNS: convenient little trick to respond for certain mDNS queries over traditional DNS
- * METRICS_PORT for Prometheuse (default to 9253)
+ * METRICS_LISTEN for Prometheus (default to :9253)
 
 Of course using any privileged port for these requires CAP_NET_BIND_SERVICE.
 
diff --git a/context/runtime/boot/entrypoint.sh b/context/runtime/boot/entrypoint.sh
index bf2d93b..44a661e 100755
--- a/context/runtime/boot/entrypoint.sh
+++ b/context/runtime/boot/entrypoint.sh
@@ -30,7 +30,7 @@ DNS_PORT="${DNS_PORT:-}"
 DNS_STUFF_MDNS="${DNS_STUFF_MDNS:-}"
 
 # Metrics settings
-METRICS_PORT="${METRICS_PORT:-}"
+METRICS_LISTEN="${METRICS_LISTEN:-}"
 
 certs::renew(){
   local domain="$1"
diff --git a/context/runtime/config/snips/monitor.conf b/context/runtime/config/snips/monitor.conf
index fa53ed4..672b1f9 100644
--- a/context/runtime/config/snips/monitor.conf
+++ b/context/runtime/config/snips/monitor.conf
@@ -3,7 +3,7 @@ health localhost:8091
 # https://coredns.io/plugins/pprof/
 pprof localhost:6053
 # https://coredns.io/plugins/metrics/
-prometheus :{$METRICS_PORT}
+prometheus {$METRICS_LISTEN}
 # https://coredns.io/plugins/log/
 log
 # {combined}